13、They kept digging ________they must have known there was no hope.
A. as B. while C. when D. unless
科目：高中英語 來源： 題型：
They kept digging ________they must have known there was no hope.
A. as B. while C. when D. unless
科目：高中英語 來源：2008年5月山東省實驗中學高三模擬考試、英語試題 題型：014
They kept digging ________ they must have known there was no hope．
A．as
B．while
C．when
D．unless
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